When the blower fan is on , in my 190 e there is such a racket coming from the fan it feels like the blower fan is going to blow out of the dashboard. The whole dash vibrates sometimes. My question is, since there is air coming out of the vents at a pretty good force, is it the fan fins hitting the casing, that is causing this horrible noise, and not the motor going bad? If this is true why would the fins be hitting the casing and can this be fixed without purchasing new parts?(e.g. repositioning the fan or something along those lines)

Any hints, or ideas are greatly appreciated!!!

Josh